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A legal second unit is more than a lock on the basement door. Here is what zoning, fire separation, and egress actually require before you rent it out.
Basement apartments are one of the most common ways Ontario homeowners add rental income or space for family, and one of the most commonly done without a permit. Since the More Homes Built Faster Act, most Ontario municipalities now permit up to three units as of right on many residential lots, including a basement second suite. As of right zoning permission does not remove the building code requirements. It only removes the zoning barrier that used to stop the conversation before it started.
We help homeowners across Ontario turn an informal basement into a legal, code compliant secondary suite, from the zoning confirmation through the final permit drawing package.
"Zoning tells you whether you are allowed to have a second unit. The Building Code tells you whether the unit you built is actually legal to live in. Homeowners often solve the first problem and never touch the second."
Riddhi Vakharia, BCIN Designer & Principal, Inarch ConsultancyAlways. Creating a second dwelling unit is one of the few renovation types where a permit is required regardless of scope, because you are changing the building's use. The specific triggers include:
Assuming a basement with a hot plate and a lock on the door is a legal rental unit because zoning now allows a second suite on the property. Zoning permission and building code compliance are two separate approvals. A legal second unit needs fire separation between floors, proper egress windows for any bedroom, adequate ceiling height, and interconnected smoke and carbon monoxide alarms, whether or not you plan to formally rent it out.
Fire separation between units, minimum ceiling heights, and egress windows sized correctly for every bedroom.
Confirming your property and zone permit a second dwelling unit, and whether additional parking is required.
Interconnected smoke and carbon monoxide alarms, and fire-rated separation assemblies between the two units.
Bill 23 has expanded as-of-right second units in most Ontario municipalities, but permit and code compliance remain mandatory.
Find out whether your property qualifies for a legal second unit, and what it will take to get there, before you spend on renovations.
Book Your Free ConsultationWe confirm your property qualifies for a second unit and identify any parking or lot requirements.
We lay out the unit around ceiling heights, existing windows, and where a legal entrance can go.
We detail the fire-rated assemblies, alarms, and egress windows required between the two units.
Full BCIN-stamped drawings, ready for municipal submission.
We submit to the municipality and respond to initial plan review comments.
A secondary suite sits at the intersection of zoning and building code, and most drafters only handle one side of that equation. With an urban planning background alongside BCIN certification and over 15 years of global architecture experience, we confirm what your property is zoned to allow and design the unit to meet the Building Code at the same time, rather than treating them as two separate problems for you to manage.
Where a full basement apartment build-out needs plumbing, electrical, or structural input, we coordinate those trades on your behalf so you have one point of contact from zoning confirmation through permit approval, anywhere in Ontario.
Book a free feasibility consultation and find out what a legal secondary suite actually takes.
05 Nov 2024
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